Materials Literature
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We report electronic transport experiments on a graphene single electron transistor. The device consists of a graphene island connected to source and drain electrodes via two narrow graphene constrictions. It is electrostatically tunable by three lateral graphene gates and an additional back gate. The tunneling coupli…
There are now a variety of preparatory procedures for nanoscale gold rods, triangular prisms, and spheres. Many of these methods rely on seed-mediated approaches with cetyltrimethylammonium bromide (CTABr) as a surfactant. Interestingly, seemingly similar preparatory procedures yield very different morphologies, and a…
Ethanol oxidation on Pt is a typical multistep and multiselectivity heterogeneous catalytic process. A comprehensive understanding of this fundamental reaction would greatly benefit design of catalysts for use in direct ethanol fuel cells and the degradation of biomass-derived oxygenates. In this work, the reaction ne…
Drug targeting systems are nanometre-sized carrier materials designed for improving the biodistribution of systemically applied (chemo)therapeutics. Various different tumour-targeted nanomedicines have been evaluated over the years, and clear evidence is currently available for substantial improvement of the therapeut…
The magnetic, resistive and thermal properties of the phase-separated compound La 0.27 Nd 0.4 Ca 0.33 MnO 3 have been experimentally studied. The sample is found to experience a charge/orbital ordering transition at ∼175 K and an antiferromagnetic (AFM) transition at ∼156 K without a magnetic field. A magnetic field s…
A simple change in the identity of “R” in the family of complexes of general formula [Mn 6 O 2 (R-sao) 6 (O 2 C-th) 2 L 4-6 ] (where saoH 2 = salicylaldoxime) causes subtle changes in the magnetic core of the compounds that leads to dramatic changes in the magnetic behaviour, switching the pairwise exchange interactio…
The deformation in the vicinity of a crack tip is governed by the presence of plastic strains and plastic strain gradients. Statistically stored and geometrically necessary dislocations related to these measures of deformation play a vital role in fatigue crack growth of metals. Both kinds of dislocation are responsib…
(1− x − y )BiScO 3 – y BiGaO 3 – x PbTiO 3 (BGSPT x / y ) piezoelectric ceramics were synthesized using the conventional oxide process. The phase diagram around the ternary morphotropic phase boundary of BGSPT x / y has been determined. It was found that BGSPT0.55/0.19 ceramics possessed a high Curie temperature ( T C…
The twinned magnetic microstructure of Ni2MnGa ferromagnetic shape-memory alloy is investigated by high resolution nanoscale modulus mapping. A surprisingly fine near-surface nanoscale substructure of closure magnetic twin variants was observed. The lateral distance between adjacent closure variants was found to be 10…
The measurement of small-angle neutron scattering on functionalized single-wall carbon nanotubes in solution is reported. Without the use of surfactants, isolated rigid rod behavior of functionalized single-wall carbon nanotubes has been observed. The onset of pinning between the nanotubes at different pinning distanc…
The correlated Einstein model for EXAFS parallel and perpendicular mean-square relative displacements (MSRDs) is discussed. By means of dynamical simulations on different crystalline structures, the error owing to the Einstein-fit model on the EXAFS MSRDs is estimated as a function of the standard deviation of the den…
This paper describes the sputter deposition and characterization of nickel titanium (NiTi) thin film shape memory alloy onto the surface of an optical fiber Bragg grating. The NiTi coating uniformity, crystallinity, and transformation temperatures are measured using scanning electron microscope, x-ray diffraction, and…
The performance of a 10 mm diameter pyroelectric detector coated with a single-wall carbon nanotube (SWCNT) was evaluated in the 0.8 to 20 microm wavelength range. The relative spectral responsivity of this detector exhibits significant fluctuations over the wavelength range examined. This is consistent with independe…
A new chiral cationic amphiphile has been synthesized. Sol-gel transcriptions were carried out to control mesoporous silica nanostructures using the organic self-assemblies of this amphiphile as templates. Left-handed coiled mesoporous silica nanoribbons were obtained in the mixture of 1-propanol and 2.5 wt% NH(3) aq.…
A single crystal copper nanowire was bent and characterized using high resolution electron backscatter diffraction. The boundary conditions of the experiment were studied using crystal plasticity finite element analysis in conjunction with a dislocation density based constitutive hardening model including geometricall…
Silicone rubber seals are being considered for a number of interfaces on NASA's Crew Exploration Vehicle (CEV). Some of these joints include the docking system, hatches, and heat shield-to-back shell interface. A large diameter molded silicone seal is being developed for the Low Impact Docking System (LIDS) that forms…
The relation between annealing temperature and surface photovoltage (SPV) shifts on the $\text{Si}(111)7\ifmmode\times\else\texttimes\fi{}7$ surface of lightly $n$-doped substrates has been studied by core-level and valence-band photoelectron spectroscopies at 100 K. The SPV shift was found to depend strongly on the a…
Double photoionization (DPI) of an atom by a single photon is a direct consequence of electron-electron interactions within the atom. We have measured the evolution of the K-shell DPI from threshold up in transition metals by high-resolution x-ray emission spectroscopy of the Kh alpha hypersatellites, photoexcited by…
Abstract We report the results of the first principles calculations performed in order to investigate the electronic and magnetic properties of the Fe–N systems and to clarify the origin of giant magnetic moments in Fe–N systems. After geometrical optimization, the densities of states have been evaluated with atom res…
We have studied the temperature dependence of the growth mode and microstructure evolution in highly mismatched sputter-grown ZnO/Al(2)O(3)(0001) heteroepitaxial films. The growth mode was studied by real-time synchrotron x-ray scattering. We find that the growth mode changes from a two-dimensional (2D) layer to a 3D…